CN217158363U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application relates to a battery monomer, battery and power consumption device belongs to battery manufacturing technical field. The application provides a battery monomer, includes: a housing having an opening; an end cap for covering the opening; an electrode assembly disposed inside the case, the end cap being located at one side of the electrode assembly in a first direction, a winding axis of the electrode assembly extending in a second direction, the first direction being disposed perpendicular to the second direction; wherein a projection for limiting a displacement amount of the electrode assembly in the first direction is formed on the inner surface of the case at a position near the opening. Because the influence of the environments such as jolt, vibration and the like on the internal parts of the single battery is reduced, the single battery has better safety performance and service life. The application also provides a battery and an electric device, comprising the battery monomer.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of battery manufacturing, in particular to a battery cell, a battery and an electric device.

Background

With the continuous prosperity of the new energy automobile market, the power battery industry is rapidly expanded and strengthened, the lithium battery technology is increasingly refined, and higher requirements on the safety performance, the energy density and the industrialization requirements of the battery monomer are provided.

In the using process of the power battery, due to the environments of jolting, vibration and the like, parts with large internal weight can bounce up and down due to the self weight, so that the parts connected with the parts are broken, and the internal structure of the power battery is damaged.

SUMMERY OF THE UTILITY MODEL

Therefore, the battery cell, the battery and the electric device are provided, so that the influence of environments such as bumping and vibration on internal parts of the battery cell is reduced, and the safety performance and the service life of the battery cell are improved.

An embodiment of a first aspect of the present application provides a battery cell, including: a housing having an opening; an end cap for covering the opening; an electrode assembly disposed inside the case, the end cap being located at one side of the electrode assembly in a first direction, a winding axis of the electrode assembly extending in a second direction, the first direction being disposed perpendicular to the second direction; wherein a projection for limiting a displacement amount of the electrode assembly in the first direction is formed on the inner surface of the case at a position near the opening.

In the battery monomer of this application embodiment, the position that the casing internal surface is close to the opening forms the bulge, and the bulge has restricted electrode subassembly displacement volume on the first direction, and jolt, under the vibration environment, electrode subassembly activity space on the first direction diminishes to reduced electrode subassembly amplitude of rocking on the first direction, the part of being connected with electrode subassembly is difficult for taking place the fracture, thereby improved battery monomer's security performance and life.

According to some embodiments of the application, the protrusion is elongated extending along the second direction.

In the above aspect, the projection extends along the second direction and can uniformly abut against the electrode assembly along the second direction to limit the amount of displacement of the electrode assembly in the first direction.

According to some embodiments of the present application, the housing includes two first side walls disposed opposite to each other in a third direction, an inner surface of each of the first side walls is formed with the protruding portion, and the third direction is perpendicular to both the first direction and the second direction.

In the above aspect, the inner surfaces of both the first side walls are formed with the protrusions, enabling a narrow space to be formed in the third direction to limit the amount of displacement of the electrode assembly in the first direction.

According to some embodiments of the application, both ends of the protrusion extend to edges of the first sidewall, respectively.

In the above aspect, the both ends of the projection extend to the edge of the first sidewall, and the area for abutting against the electrode assembly can be increased along the second direction, thereby abutting against the electrode assembly more uniformly to limit the amount of displacement of the electrode assembly in the first direction.

According to some embodiments of the application, the housing comprises two second side walls oppositely arranged along the second direction, and the second side walls are spliced with the first side walls.

In the above scheme, the casing is formed in the concatenation of second lateral wall and first lateral wall, does benefit to the shaping of the bulge of first lateral wall, reduces the manufacturing cost of casing.

According to some embodiments of the present application, an area of the first sidewall is larger than an area of the second sidewall.

In the above aspect, the area of the first side walls is larger than that of the second side walls, and the protruding parts of the inner surfaces of the two first side walls have a larger fitting area with the electrode assembly, so as to uniformly abut against the electrode assembly to limit the displacement amount of the electrode assembly in the first direction.

According to some embodiments of the application, the first side wall comprises a body and flanges, the protruding portion is formed on the inner surface of the body, and the flanges of the two first side walls are spliced to form the bottom wall of the shell.

In the above scheme, the turn-ups concatenation of two first lateral walls forms the diapire of casing, has reduced the quantity of the part of concatenation shaping casing, has simplified the concatenation shaping process of casing, has reduced the manufacturing cost of casing.

According to some embodiments of the present application, the electrode assembly includes a main body, a first tab and a second tab, the first tab and the second tab are respectively located at both sides of the main body along the second direction, polarities of the first tab and the second tab are opposite, and the protrusion is configured to abut against the main body to limit a displacement amount of the electrode assembly in the first direction.

In the above scheme, because the main part is located between first utmost point ear and the second utmost point ear, the bulge is used for with the main part butt, makes electrode assembly the reaction force of bulge is born to its middle part when rocking, reduces the damage of reaction force to electrode assembly of bulge, has better security, and the main part need not be connected with other parts, has sufficient area and the cooperation of bulge, has better equipment just easy nature.

According to some embodiments of the present application, the main body includes a flat region and a first bent region, the first bent region is located at a side of the flat region close to the opening in the first direction, and the protruding portion is configured to abut against the first bent region to limit a displacement amount of the electrode assembly in the first direction.

In the above aspect, the projection limits the amount of displacement of the electrode assembly in the first direction by abutting against the first fold region of the electrode assembly, and the movement of the electrode assembly can be limited from the side of the electrode assembly away from the bottom wall of the case, so that the configuration of the electrode assembly is not damaged while the amount of movement of the electrode assembly is limited.

According to some embodiments of the present application, a minimum distance between the protrusion and the first bending zone is D ≦ 1 mm.

In the above scheme, the minimum distance D between the limiting protruding part and the first bending area is less than or equal to 1mm, so that the protruding part can be ensured to be effectively abutted against the first bending area when the electrode assembly shakes along the first direction.

According to some embodiments of the application, the projection comprises a first inclined surface facing the first bending zone, the first inclined surface extending obliquely from the inner surface of the housing in a direction close to the opening, the first inclined surface being adapted to abut against the first bending zone.

In the above aspect, the first inclined surface abuts against the first bending region, and the contact area between the protruding portion and the electrode assembly can be increased, so that the movement space of the electrode assembly can be safely and reliably limited.

According to some embodiments of the present application, the battery cell further comprises: a first electrode terminal and a second electrode terminal disposed at the end cap; a first current collecting member disposed within the case for connecting the first electrode terminal and the first tab; and the second current collecting component is arranged in the shell and is used for connecting the second electrode terminal and the second tab.

In the above-described aspect, each electrode terminal and the corresponding tab are connected by one current collecting member, respectively, and since the protrusion limits the amount of movement of the electrode assembly in the first direction, the movement of the electrode assembly becomes small, reducing the possibility of breakage of the first and second current collecting members due to shaking of the electrode assembly.

According to some embodiments of the present application, the projection includes a second inclined surface facing the opening, the second inclined surface extending obliquely from an inner surface of the case in a direction away from the opening, the second inclined surface for guiding the electrode assembly into the case.

In the above scheme, the second inclined surface is used for guiding the electrode assembly into the case, so that the protrusion can be prevented from scratching the surface of the electrode assembly, and the safety performance of the battery cell is improved.

According to some embodiments of the present application, a cross-section of the protrusion on a plane perpendicular to the first direction is a semicircular shape or a polygonal prism shape.

In the above scheme, the cross section of the convex part is a semicircular shape or a polygonal prismatic shape, so that the shape is simple, the manufacturing and molding are easy, and the first inclined surface and the second inclined surface can be formed.

According to some embodiments of the present application, the battery cell further comprises: an insulating layer covering a surface of the protrusion.

In above-mentioned scheme, set up the insulating layer on the surface of bulge, can insulate isolation bulge and electrode subassembly, avoid the electrode subassembly damage in order to with the unexpected short circuit of bulge.

According to some embodiments of the present application, the battery cell further comprises: and an insulating member disposed between the electrode assembly and the end cap for insulating and isolating the electrode assembly and the end cap, wherein the protrusion is at least partially located between the insulating member and the electrode assembly in the first direction.

In the above scheme, the protruding part is at least partially located between the insulating member and the electrode assembly, and the mounting space of the insulating member can be avoided in the first direction, so that the gap between the edge of the insulating member and the inner surface of the shell is reduced, and the assembling and the positioning of the insulating member are facilitated.

In a second aspect of the present application, a battery is provided, which includes the battery cell described in the first aspect of the present application.

Due to the characteristics of the single battery in the embodiment of the first aspect of the present application, the battery in the embodiment of the second aspect of the present application also has better safety performance and service life.

In an embodiment of the third aspect of the present application, an electric device is provided, which includes the battery of the embodiment of the second aspect of the present application, and the battery is used for providing electric energy.

Due to the characteristics of the battery of the embodiment of the second aspect of the present application, the electric device of the embodiment of the third aspect of the present application also has better safety performance and service life.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application;

FIG. 2 is a schematic diagram of the battery of the vehicle of FIG. 1;

fig. 3 illustrates a schematic diagram of a battery cell according to some embodiments of the present application;

fig. 4 illustrates an exploded view of a battery cell of some embodiments of the present application;

fig. 5 illustrates a schematic structural view of a housing in a battery cell according to some embodiments of the present application;

FIG. 6 shows a cross-sectional view A-A of FIG. 3;

FIG. 7 shows a partial enlarged view at B in FIG. 6;

fig. 8 and 9 are cross-sectional views of two forms of the protrusions, respectively, in a battery cell of some embodiments of the present application;

the figures are not provided to scale.

Icon: 1000-a vehicle; 100-a battery; 10-a battery cell; 11-a housing; 111-opening; 112-a first side wall; 1121-body; 1122-flanging; 1123 — a first edge; 1124-a second edge; 113-a second sidewall; 114-a bottom wall; 115-a projection; 1151-a first bevel; 1152-a second bevel; 1153-top; 12-an end cap; 13-an electrode assembly; 131-a body; 1311-straight zone; 1312-a first bending zone; 1313-second bending zone; 132-a first tab; 133-a second tab; 14-a first electrode terminal; 15-a second electrode terminal; 16-a first current collecting member; 17-a second current collecting member; 18-an insulator; 19-an insulating layer; 200-a controller; 20-a box body; 21-a first part; 22-a second part; 300-a motor; x-a second direction; y-a third direction; z-first direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Throughout the description of the present application, it is to be noted that unless otherwise expressly specified or limited the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the diaphragm may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell also comprises a current collecting component and an electrode terminal, wherein the current collecting component is used for electrically connecting the lug of the battery cell and the electrode terminal with the same polarity so as to transmit electric energy from the electrode component to the electrode terminal and transmit the electric energy to the outside of the battery cell through the electrode terminal; the plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells.

In the related art, in the assembly process of the battery cell, the electrode terminal is mounted to the end cap, the electrode assembly is placed inside the case, the tab of the electrode assembly is connected to the electrode terminal through the current collecting member, and the end cap is welded to the case, thereby fixing the case, the end cap, the electrode terminal, the current collecting member, and the electrode assembly as a whole. In the use process of the battery cell, due to environmental influences such as jolt and vibration, parts inside the battery cell can be damaged.

The inventors have studied and found that, in the components constituting the battery cell, the weight of the electrode assembly is large, and in an environment of bumping, vibration, and the like, the impact force of the electrode assembly on the components connected thereto is the largest due to the self weight of the electrode assembly, and thus the components connected to the electrode assembly are also most likely to be damaged.

Based on the thought, this application provides a new technical scheme, through reducing the activity space of electrode subassembly, reduces the influence of environment such as jolt, vibration to battery monomer internal part, has improved battery monomer's security performance and life.

It can be understood that the battery cell described in the embodiments of the present application may directly supply power to an electric device, or may form a battery in parallel or in series, so as to supply power to various electric devices in the form of a battery.

It is to be understood that the electric device using the battery cell or the battery described in the embodiments of the present application may be applied to various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like, an electric toy including a stationary type or a mobile type electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.

The battery cell and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may be applied to all electric devices using the battery cell and the battery.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application; fig. 2 shows a schematic diagram of the battery of the vehicle in fig. 1.

As shown in fig. 1 and 2, a battery 100, a controller 200, and a motor 300 are provided inside a vehicle 1000, and the battery 100 may be provided, for example, at the bottom or the head or tail of the vehicle 1000. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used for power supply of vehicle 1000, for example, battery 100 may be used as an operating power source of vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operation power demand at the start, navigation, and traveling of the vehicle 1000.

In other embodiments, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1000.

Here, the battery 100 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 is formed by connecting a plurality of battery cells 10 in series or in parallel.

As shown in fig. 2, the battery 100 includes a plurality of battery cells 10 and a case 20, and the plurality of battery cells 10 are placed in the case 20. The case 20 includes a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 are covered with each other to form a battery cavity, and the plurality of battery cells 10 are placed in the battery cavity. Wherein the shape of the first portion 21 and the second portion 22 may be determined according to the shape of the combination of the plurality of battery cells 10, and the first portion 21 and the second portion 22 may each have one opening 111. For example, each of the first and second portions 21 and 22 may be a hollow rectangular parallelepiped and only one surface of each may be an opening 111 surface, the openings 111 of the first and second portions 21 and 22 are oppositely disposed, and the first and second portions 21 and 22 are fastened to each other to form the case 20 having a closed chamber. The plurality of battery cells 10 are connected in parallel or in series-parallel combination and then placed in a box body 20 formed by buckling a first part 21 and a second part 22.

Fig. 3 illustrates a schematic diagram of a battery cell according to some embodiments of the present application; fig. 4 illustrates an exploded view of a battery cell of some embodiments of the present application; fig. 5 illustrates a schematic view of a housing in a battery cell according to some embodiments of the present application.

As shown in fig. 3, 4 and 5, the battery cell 10 includes a case 11, an end cap 12, an electrode assembly 13, a first electrode terminal 14, a second electrode terminal 15, a first current collecting member 16, a second current collecting member 17 and an insulator 18.

The case 11 may have a square shape or other shapes, and the case 11 has a receiving chamber formed therein for receiving the electrode assembly 13 and the electrolyte. One end of the case 11 has an opening 111 so that the electrode assembly 13 can be placed inside the case 11 through the opening 111. The housing 11 may be made of a metal material such as aluminum, aluminum alloy, or nickel-plated steel.

In some embodiments of the present application, the housing 11 is square, the height direction extends along a first direction Z, the length direction extends along a second direction X, the thickness direction extends along a third direction Y, an opening 111 is disposed on one side of the housing 11 along the first direction Z, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other.

The end cap 12 is used to close the opening 111 of the case 11 to enclose the electrode assembly 13 inside the case 11. The end cap 12 may be made of a metal material, such as aluminum, steel, etc.

The end cap 12 is provided with two electrode lead-out holes, and the first electrode terminal 14 and the second electrode terminal 15 are respectively provided in the two electrode lead-out holes of the end cap 12. The first electrode terminal 14 is a positive electrode terminal, and the second electrode terminal 15 is a negative electrode terminal.

In some embodiments of the present application, the end cap 12 has a flat plate shape, the size and shape of the end cap 12 match the opening 111 of the case 11, and the end cap 12 is fixed to the opening 111 of the case 11, thereby sealing the electrode assembly 13 and the electrolyte in the receiving cavity of the case 11.

For example, the end cap 12 has a length direction extending in the second direction X, a width direction extending in the third direction Y, a thickness direction extending in the first direction Z, and the first and second electrode terminals 14 and 15 spaced apart from each other in the second direction X.

In other embodiments, the end cap 12 may have other shapes, such as a circular shape or an oval shape, and the first electrode terminal 14 and the second electrode terminal 15 may have other arrangements, depending on the shape of the battery cell 10.

The electrode assembly 13 is disposed inside the case 11, and a winding axis of the electrode assembly 13 extends in the second direction X.

As shown in fig. 4, the electrode assembly 13 includes a main body 131, a first tab 132 and a second tab 133, the first tab 132 and the second tab 133 being located at both sides of the main body 131 along the second direction X, the first tab 132 and the second tab 133 having opposite polarities. The main body 131 includes a positive electrode plate, a negative electrode plate, and an isolation film located between the positive electrode plate and the negative electrode plate for isolating the positive electrode plate from the negative electrode plate. The first tab 132 is a positive tab, the second tab 133 is a negative tab, the first electrode terminal 14 and the first tab 132 are connected by the first current collecting member 16, and the second electrode terminal 15 and the second tab 133 are connected by the second current collecting member 17.

An insulator 18 is disposed between the electrode assembly 13 and the end cap 12 for insulating and isolating the electrode assembly 13 and the end cap 12.

Specifically, the insulating member 18 serves to insulate and isolate the electrode assembly 13 from the first and second electrode terminals 14 and 15 provided to the end cap 12.

The insulating member 18 may be provided with one, one insulating member 18 insulating both the electrode assembly 13 and the first and second electrode terminals 14 and 15 provided to the cap 12; the insulating member 18 may be provided in two, as shown in fig. 4, one insulating member 18 for insulating the first electrode terminal 14 from the electrode assembly 13, and the other insulating member 18 for insulating the second electrode terminal 15 from the electrode assembly 13.

In some embodiments of the present application, the insulator 18 is a plastic piece. In other embodiments, the insulator 18 may also be a silicone piece.

As shown in fig. 3, 4 and 5, some embodiments of the present application provide a battery cell 10 including a case 11, an end cap 12 and an electrode assembly 13, where the case 11 has an opening 111, the end cap 12 is used to cover the opening 111, the electrode assembly 13 is disposed inside the case 11, the end cap 12 is located on one side of the electrode assembly 13 along a first direction Z, a winding axis of the electrode assembly 13 extends along a second direction X, and the first direction Z is perpendicular to the second direction X. Wherein, a projection 115 is formed on the inner surface of the case 11 at a position close to the opening 111, and the projection 115 is used for limiting the displacement amount of the electrode assembly 13 in the first direction Z.

The case 11 includes a bottom wall 114, the bottom wall 114 is disposed opposite to the opening 111 along the first direction Z, the electrode assembly 13 is placed inside the case 11, and the bottom wall 114 and the protrusion 115 together limit a moving space of the electrode assembly 13 in the first direction Z. In some embodiments of the present application, the first direction Z extends along the gravity direction, the electrode assembly 13 is placed on the bottom wall 114, and the protrusion 115 is located on the upper side of the bottom wall 114, so as to limit the magnitude of upward jump of the electrode assembly 13 in a bumpy, vibrating environment. In other embodiments, the first direction Z may also extend in a horizontal direction or other directions.

The position of the inner surface of the housing 11 near the opening 111 refers to a portion of the inner surface of the housing 11 from the middle to near the opening 111 along the first direction Z.

In the first direction Z, the protruding portion 115 may abut against one side edge of the electrode assembly 13 along the first direction Z, or may abut against the concave-convex structure on the electrode assembly 13; in the second direction X, the protruding part 115 may abut against the main body 131 of the electrode assembly 13, or may abut against the first and second tabs 132 and 133 of the electrode assembly 13.

The projections 115 may be continuously arranged around the opening 111 to form a closed ring shape, and the projections 115 may have a plurality of projections 115, and the plurality of projections 115 are arranged at intervals around the opening 111, and the plurality of projections 115 are in common abutment with the electrode assembly 13. The cross section of the protrusion 115 may be square, semicircular, or polygonal, etc. The protruding portion 115 may be integrally formed with the housing 11, or may be mounted to the housing 11 in an assembled manner.

The thickness of the protrusion 115 may be greater than the thickness of the rest of the housing 11, i.e. the protrusion 115 protrudes from the inner surface of the housing 11 while its corresponding outer surface has no recess; it is also possible to form the concave portion on the corresponding outer surface of the housing 11 at the same time as the convex portion 115 is molded. In a preferred form, the thickness of the protrusion 115 is greater than the thickness of the rest of the housing 11, and a mounting groove is formed inside the opening 111 of the housing 11 for receiving the end cap 12, and when the end cap 12 and the housing 11 are welded by laser, the protrusion 115 can enhance the strength of the opening 111, prevent the laser from breaking through the housing 11 and the opening 111 of the housing 11 from being deformed, and the like, and improve the welding quality of the end cap 12 and the housing 11.

In the battery cell 10 of the embodiment of the present application, the protrusion 115 is formed at a position, close to the opening 111, of the inner surface of the case 11, the protrusion 115 limits a displacement amount of the electrode assembly 13 in the first direction Z, and in a bumpy and vibrating environment, an active space of the electrode assembly 13 in the first direction Z becomes small, so that a shaking amplitude of the electrode assembly 13 in the first direction Z is reduced, a part connected with the electrode assembly 13 is not easily broken, and safety performance and a service life of the battery cell 10 are improved.

As shown in fig. 4 and 5, in some embodiments of the present application, the protrusion 115 has a long bar shape extending along the second direction X.

The protrusion 115 extends along the second direction X to cover a length range of the electrode assembly 13 as much as possible in the second direction X, thereby increasing a contact area with the electrode assembly 13.

In the above aspect, the protruding portion 115 extends along the second direction X, and can uniformly abut against the electrode assembly 13 along the second direction X to limit the displacement amount of the electrode assembly 13 in the first direction Z.

As shown in fig. 4 and 5, in some embodiments of the present application, the housing 11 includes two first sidewalls 112 oppositely disposed along a third direction Y, an inner surface of each first sidewall 112 is formed with a protrusion 115, and the third direction Y is perpendicular to both the first direction Z and the second direction X.

Based on the foregoing square-shaped embodiment of the housing 11, the housing 11 includes four side walls (i.e., two first side walls 112 and two second side walls 113 described below) and a bottom wall 114, the four side walls and the bottom wall 114 may form the housing 11 in an integrally formed manner, and the four side walls and the bottom wall 114 may also form the housing 11 in a spliced manner. Based on the embodiment of the housing 11 formed by splicing, the bottom wall 114 can be formed by folding the edges of the side walls inward, or can be formed by splicing a separate member to the side walls.

The surfaces of the two first sidewalls 112 facing the electrode assembly 13 are inner surfaces thereof, and the shape and position of the protrusions 115 of the two first sidewalls 112 may be the same or different.

In the above aspect, the inner surfaces of both the first side walls 112 are formed with the protrusions 115, enabling a narrow space to be formed in the third direction Y to limit the amount of displacement of the electrode assembly 13 in the first direction Z.

In other embodiments, the protruding portion 115 may have a plurality of protruding portions 115, and the protruding portions 115 have a hemispherical shape, a square shape, and the like, and the plurality of protruding portions 115 are disposed at intervals along the second direction X on the first sidewall 112.

In some embodiments of the present application, both ends of the protrusion 115 extend to the edges of the first sidewall 112, respectively.

Specifically, two edges of the first sidewall 112 along the second direction X are a first edge 1123 and a second edge 1124, respectively, and both ends of the protruding portion 115 extend to the first edge 1123 and the second edge 1124, respectively.

In the above aspect, both ends of the protruding portion 115 extend to the edge of the first sidewall 112, and the area for abutting against the electrode assembly 13 can be increased along the second direction X, thereby abutting against the electrode assembly 13 more uniformly to limit the displacement amount of the electrode assembly 13 in the first direction Z.

In some embodiments of the present application, the housing 11 includes two second sidewalls 113 oppositely disposed along the second direction X, and the second sidewalls 113 are spliced with the first sidewalls 112.

The second side wall 113 and the first side wall 112 may have the same area, i.e. the bottom wall 114 is square; the second side wall 113 and the first side wall 112 may have different areas, i.e. the bottom wall 114 is rectangular.

The projections 115 may be disposed only on the inner surfaces of the two first sidewalls 112; the protrusions 115 may also be simultaneously disposed on the inner surfaces of the two first sidewalls 112 and the inner surfaces of the two second sidewalls 113.

In the above scheme, the second side wall 113 and the first side wall 112 are spliced to form the housing 11, which is beneficial to molding the protruding portion 115 of the first side wall 112, and reduces the manufacturing cost of the housing 11.

In some embodiments of the present application, the area of the first sidewall 112 is greater than the area of the second sidewall 113.

The first sidewall 112 corresponds to a major side of the electrode assembly 13, i.e., the side of the electrode assembly 13 corresponding to the first sidewall 112 has an area greater than the remaining sides.

In the above aspect, the area of the first sidewall 112 is larger than the area of the second sidewall 113, and the protrusions 115 of the inner surfaces of the two first sidewalls 112 have a larger fitting area with the electrode assembly 13, so as to uniformly abut against the electrode assembly 13 to limit the displacement amount of the electrode assembly 13 in the first direction Z.

As shown in fig. 4, in some embodiments of the present application, the first side wall 112 includes a body 1121 and a flange 1122, the protrusion 115 is formed on an inner surface of the body 1121, and the flanges 1122 of the two first side walls 112 are spliced to form the bottom wall 114 of the housing 11.

The normal direction of the body 1121 extends in the third direction Y, and the normal direction of the flange 1122 extends in the first direction Z. The edges of the flanges 1122 of the two first side walls 112 are connected, and the two flanges 1122 together form the bottom wall 114 of the housing 11.

In the above solution, the flanges 1122 of the two first side walls 112 are spliced to form the bottom wall 114 of the housing 11, so that the number of parts for splicing and forming the housing 11 is reduced, the splicing and forming process of the housing 11 is simplified, and the manufacturing cost of the housing 11 is reduced.

In some embodiments of the present application, the electrode assembly 13 includes a main body 131, a first tab 132 and a second tab 133, the first tab 132 and the second tab 133 are respectively located on both sides of the main body 131 along the second direction X, the polarities of the first tab 132 and the second tab 133 are opposite, and the protrusion 115 is configured to abut against the main body 131 to limit the displacement amount of the electrode assembly 13 in the first direction Z.

A projected profile of the body 131 is greater than projected profiles of the first and second tabs 132 and 133 on a plane (i.e., YZ plane) perpendicular to the second direction X. When the electrode assembly 13 shakes, the main body 131 abuts against the tab 115 prior to the tab.

The protruding portion 115 may abut against one side edge of the main body 131 along the first direction Z, or some concave-convex structures may be provided on the main body 131, and the protruding portion 115 is engaged with the concave-convex structures.

In the above solution, since the main body 131 is located between the first tab 132 and the second tab 133, and the protruding portion 115 is used for abutting against the main body 131, so that the middle of the electrode assembly 13 bears the reaction force of the protruding portion 115 when the electrode assembly 13 shakes, the damage of the reaction force of the protruding portion 115 to the electrode assembly 13 is reduced, and the safety is better, and the main body 131 does not need to be connected with other components, has a sufficient area to be matched with the protruding portion 115, and has better assembly convenience.

FIG. 6 shows a cross-sectional view A-A of FIG. 3; fig. 7 shows a partial enlarged view at B in fig. 6.

As shown in fig. 6 and 7, in some embodiments of the present application, the main body 131 includes a flat region 1311 and a first bent region 1312, and the first bent region 1312 is located on a side of the flat region 1311 close to the opening 111 along the first direction Z, and the protrusion 115 is configured to abut against the first bent region 1312 to limit an amount of displacement of the electrode assembly 13 in the first direction Z.

The main body 131 further includes a second bending region 1313, and along the first direction Z, the second bending region 1313 is located on one side of the flat region 1311 close to the bottom wall 114, and the second bending region 1313 is in insulation abutment with the bottom wall 114.

In the above aspect, the protrusion 115 limits the amount of displacement of the electrode assembly 13 in the first direction Z by abutting against the first bent region 1312 of the body 131, and can limit the movement of the electrode assembly 13 from the side of the electrode assembly 13 away from the bottom wall 114 of the case 11, so that the configuration of the electrode assembly 13 is not broken while limiting the amount of movement of the electrode assembly 13.

As shown in FIG. 7, in some embodiments of the present application, the minimum separation between the protrusion 115 and the first inflection region 1312 is D ≦ 1 mm.

The minimum distance D between the protrusion 115 and the first bending region 1312 is defined as the minimum distance between the outer surface of the first bending region 1312 and the protrusion 115 along the normal P of the first bending region 1312.

In the above solution, the minimum distance D between the limiting protrusion 115 and the first bending region 1312 is less than or equal to 1mm, so that the protrusion 115 can be ensured to be effectively abutted against the first bending region 1312 when the electrode assembly 13 shakes along the first direction Z.

In some embodiments of the present application, the protrusion 115 includes a first inclined surface 1151 facing the first bending region 1312, the first inclined surface 1151 extends obliquely from the inner surface of the housing 11 to a direction close to the opening 111, and the first inclined surface 1151 is configured to abut against the first bending region 1312.

Taking the protrusion 115 on the first sidewall 112 as an example, the maximum size of the protrusion 115 protruding from the inner surface of the corresponding first sidewall 112 is the top 1153, one side of the first inclined surface 1151 near the bottom wall 114 is connected to the inner surface of the housing 11, and the other side extends to the top 1153. The first inclined surface 1151 may be a flat surface or a curved surface.

Along the normal P of the first bending region 1312, a distance D is defined between the outer surface of the first bending region 1312 and the first inclined surface 1151.

In the above configuration, the first inclined surface 1151 abuts against the first bending region 1312, and the contact area between the protruding portion 115 and the electrode assembly 13 can be increased, thereby safely and reliably limiting the movement space of the electrode assembly 13.

As shown in fig. 7, in some embodiments of the present application, the protrusion 115 includes a second inclined surface 1152 facing the opening 111, the second inclined surface 1152 extending obliquely from the inner surface of the case 11 in a direction away from the opening 111, the second inclined surface 1152 serving to guide the electrode assembly 13 into the case 11.

Taking the protrusion 115 on the first sidewall 112 as an example, one side of the second slope 1152 near the opening 111 is connected to the inner surface of the housing 11, and the other side extends to the top 1153. The second inclined surface 1152 may be a flat surface or a curved surface.

In the above-described aspect, the second inclined surface 1152 serves to guide the electrode assembly 13 into the case 11, and the protrusion 115 can be prevented from scratching the surface of the electrode assembly 13, thereby improving the safety of the battery cell 10.

As shown in fig. 4, in some embodiments of the present application, the battery cell 10 further includes a first electrode terminal 14, a second electrode terminal 15, a first current collecting member 16, and a second current collecting member 17, the first electrode terminal 14 and the second electrode terminal 15 being disposed at the end cap 12. The first current collecting member 16 and the second current collecting member 17 are disposed in the case 11, the first current collecting member 16 is used to connect the first electrode terminal 14 and the first tab 132, and the second current collecting member 17 is used to connect the second electrode terminal 15 and the second tab 133.

The first and second collecting members 16 and 17 are each connected to the electrode assembly 13, and the body 131 is located between the first and second tabs 132 and 133 along the second direction X and is not directly connected to the first and second collecting members 16 and 17. The first current collecting member 16 and the second current collecting member 17 are generally rigid pieces extending substantially in the first direction Z, and are susceptible to fatigue fracture in the event of an impact in the first direction Z.

In the above-described aspect, since the amount of movement of the electrode assembly 13 in the first direction Z is limited by the protrusion 115, the amplitude of movement of the electrode assembly 13 becomes small, reducing the possibility of the first collecting member 16 and the second collecting member 17 breaking due to shaking of the electrode assembly 13.

Fig. 8 and 9 are cross-sectional views of two forms of the protrusions, respectively, in a battery cell of some embodiments of the present application.

As shown in fig. 8 and 9, in some embodiments of the present application, the cross-section of the convex portion 115 is a semicircular shape or a polygonal prism shape on a plane (i.e., XY plane) perpendicular to the first direction Z.

For example, as shown in fig. 8, when the cross section of the projection 115 is semicircular, the top 1153 is an apex of the semicircle, the first inclined surface 1151 is a portion of the projection 115 extending from the top 1153 in a direction closer to the opening 111, and the second inclined surface 1152 is a portion of the projection 115 extending from the top 1153 in a direction closer to the bottom wall 114. When the cross section of the projection 115 is polygonal, as shown in fig. 9, the top 1153 is a surface of the projection 115 which is substantially parallel to the inner surface of the housing 11, the first inclined surface 1151 is a transition surface between the top 1153 and the inner surface of the housing 11 in a direction close to the bottom wall 114, and the second inclined surface 1152 is a transition surface between the top 1153 and the inner surface of the housing 11 in a direction close to the opening 111.

In the above-mentioned embodiment, the cross section of the protruding portion 115 is a semicircular shape or a polygonal prism shape, which is not only simple in shape and easy to manufacture and mold, but also can form the first inclined surface 1151 and the second inclined surface 1152.

As shown in fig. 8 and 9, in some embodiments of the present application, the battery cell 10 further includes an insulating layer 19, and the insulating layer 19 covers the surface of the protrusion 115.

Insulating layer 19 may cover only first slope 1151; it is also possible to cover the entire surface of the projection 115. The insulating layer 19 may be formed by a coating process or an insulating film-attaching process.

In the above scheme, the insulating layer 19 is provided on the surface of the protrusion 115, so that the protrusion 115 and the electrode assembly 13 can be insulated and isolated, and the electrode assembly 13 is prevented from being damaged to be accidentally shorted with the protrusion 115.

As shown in fig. 4 and 7, in some embodiments of the present application, the battery cell 10 further includes an insulating member 18, the insulating member 18 is disposed between the electrode assembly 13 and the end cap 12 for insulating and isolating the electrode assembly 13 and the end cap 12, and the protrusion 115 is at least partially located between the insulating member 18 and the electrode assembly 13 in the first direction Z.

In the first direction Z, the protrusion 115 may be entirely located between the insulating member 18 and the electrode assembly 13, that is, the protrusion 115 is spaced apart from the insulating member 18 in the first direction Z, and the first slope 1151 is formed by extending a region of the inner surface of the case 11 on a side of the insulating member 18 close to the electrode assembly 13; in the first direction Z, the protruding portion 115 may be partially located between the insulating member 18 and the electrode assembly 13, and partially located to overlap with the insulating member 18, that is, the first inclined surface 1151 is formed by extending a region of the inner surface of the case 11 corresponding to the insulating member 18, and the top 1153 is located on a side of the insulating member 18 close to the electrode assembly 13.

In the above-described aspect, the protruding portion 115 is located at least partially between the insulating member 18 and the electrode assembly 13, and can escape from the mounting space of the insulating member 18 in the first direction Z, so that the gap between the edge of the insulating member 18 and the inner surface of the case 11 becomes small, and the assembling and positioning of the insulating member 18 are facilitated.

Some embodiments of the present application provide a battery 100 including a battery cell 10.

The battery 100 of the embodiment of the present application also has superior safety performance and lifespan due to the characteristics of the battery cell 10.

Some embodiments of the present application provide an electric device, which includes a battery 100, and the battery 100 is used for providing electric energy.

The electric device according to the embodiment of the present application also has good safety performance and a long service life due to the characteristics of the battery 100.

As shown in fig. 1 to 9, some embodiments of the present application provide a battery cell 10 including a case 11, an end cap 12, an electrode assembly 13, a first electrode terminal 14, a second electrode terminal 15, a first current collecting member 16, and a second current collecting member 17, the first electrode terminal 14 and the second electrode terminal 15 being mounted to the end cap 12. The housing 11 is formed by welding through a splicing process, an opening 111 is formed on one side of the housing 11 along the first direction Z, and the end cover 12 is used for closing the opening 111. The electrode assembly 13 is located inside the case 11, the electrode assembly 13 is a winding structure, a winding axis of the winding structure extends along the second direction X, and the electrode assembly 13 includes a main body 131 and a first tab 132 and a second tab 133 respectively located at both sides of the main body 131 along the second direction X. The first tab 132 and the first electrode terminal 14 are connected by the first current collecting member 16, and the second tab 133 and the second electrode terminal 15 are connected by the second current collecting member 17.

The case 11 includes two first sidewalls 112 oppositely disposed along the third direction Y and two second sidewalls 113 oppositely disposed along the second direction X, an area of the first sidewalls 112 is larger than an area of the second sidewalls 113, a protrusion 115 is formed on an inner surface of each first sidewall 112, a local thickness of the protrusion 115 is increased, the protrusion 115 is in a long shape extending to two side edges of the first sidewalls 112 along the second direction X, and the protrusion 115 is configured to abut against the first bending region 1312 of the main body 131 to limit a displacement amount of the electrode assembly 13 in the first direction Z. Further, the projection 115 may be protected from insulation by spraying an insulating material or attaching an insulating film thereon, and the insulating film may buffer the impact of the electrode assembly 13.

In the above scheme, the thickness of the protruding portion 115 is locally increased, the end cover 12 is placed in the mounting groove at the inner edge of the opening 111, when the end cover 12 is welded to the housing 11, laser breakdown of the housing 11 can be avoided, larger laser welding thermal stress can be endured, and the welding quality of the end cover 12 and the housing 11 is ensured. The protrusions 115 of the two first side walls 112 are oppositely arranged, so that the electrode assembly 13 can be fixedly bound, the shaking amplitude of the electrode assembly 13 in the first direction Z relative to the case 11 and the end cover 12 is reduced, the possibility of fracture of the bent part of the first current collecting member 16 and the second current collecting member 17 is further reduced, the possibility of separation of the first current collecting member 16 from the first tab 132 is reduced, the possibility of separation of the second current collecting member 17 from the second tab 133 is reduced, and the safety performance of the battery cell 10 is improved. And the protrusion 115 forms a narrow structure on the upper portion of the case 11, and after the electrode assembly 13 is placed in the case 11, the electrolyte is pressed to infiltrate the electrode assembly 13 upwards, so that the electrolyte infiltration effect of the first bending region 1312 can be improved, and the possibility of lithium deposition in the first bending region 1312 can be reduced.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (18)

1. A battery cell, comprising:

a housing having an opening;

an end cap for covering the opening;

an electrode assembly disposed inside the case, the end cap being located at one side of the electrode assembly in a first direction, a winding axis of the electrode assembly extending in a second direction, the first direction being disposed perpendicular to the second direction;

wherein a projection for limiting a displacement amount of the electrode assembly in the first direction is formed on the inner surface of the case at a position near the opening.

2. The battery cell as recited in claim 1, wherein the protrusion is elongated along the second direction.

3. The battery cell as recited in claim 1, wherein the housing includes two first side walls disposed opposite to each other in a third direction, the inner surface of each of the first side walls being formed with the protruding portion, and the third direction being perpendicular to both the first direction and the second direction.

4. The battery cell as recited in claim 3 wherein both ends of the protrusion extend to edges of the first side wall, respectively.

5. The battery cell as recited in claim 3 wherein the housing comprises two second sidewalls disposed opposite each other along the second direction, the second sidewalls being joined to the first sidewalls.

6. The battery cell as recited in claim 5 wherein the first sidewall has an area that is greater than an area of the second sidewall.

7. The battery cell as recited in claim 3, wherein the first side wall comprises a body and flanges, the protrusion is formed on an inner surface of the body, and the flanges of the two first side walls are spliced to form a bottom wall of the housing.

8. The battery cell according to any one of claims 1 to 7, wherein the electrode assembly includes a main body, a first tab and a second tab, the first tab and the second tab are respectively located on both sides of the main body along the second direction, the first tab and the second tab have opposite polarities, and the protrusion is configured to abut against the main body to limit a displacement amount of the electrode assembly in the first direction.

9. The battery cell as recited in claim 8 wherein the main body comprises a flat region and a first bent region, the first bent region is located on a side of the flat region adjacent to the opening along the first direction, and the protrusion is configured to abut against the first bent region to limit the amount of displacement of the electrode assembly in the first direction.

10. The battery cell as recited in claim 9 wherein the minimum distance between the protrusion and the first bend region is D ≦ 1 mm.

11. The battery cell as recited in claim 9, wherein the protrusion includes a first slope facing the first bending region, the first slope extending obliquely from an inner surface of the case in a direction near the opening, the first slope configured to abut against the first bending region.

12. The battery cell of claim 8, further comprising:

a first electrode terminal and a second electrode terminal disposed at the end cap;

a first current collecting member disposed within the case for connecting the first electrode terminal and the first tab;

and the second current collecting component is arranged in the shell and is used for connecting the second electrode terminal and the second tab.

13. The battery cell according to any one of claims 1 to 7, wherein the projection includes a second slope facing the opening, the second slope extending obliquely from an inner surface of the case in a direction away from the opening, the second slope being for guiding the electrode assembly into the case.

14. The battery cell according to any one of claims 1 to 7, wherein the cross section of the protruding portion is a semicircular shape or a polygonal prismatic shape on a plane perpendicular to the first direction.

15. The battery cell of any of claims 1-7, further comprising:

an insulating layer covering a surface of the protrusion.

16. The battery cell of any of claims 1-7, further comprising:

and an insulating member disposed between the electrode assembly and the end cap for insulating and isolating the electrode assembly and the end cap, wherein the protrusion is at least partially located between the insulating member and the electrode assembly in the first direction.

17. A battery comprising the cell of any one of claims 1-16.

18. An electrical device comprising a battery as claimed in claim 17 for providing electrical energy.

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